Cooling type fan tower drum cable

Abstract

The utility model discloses a fan tower drum cable capable of cooling, which comprises an aluminum alloy conductor layer, an ethylene propylene insulating layer and a chlorinated polyethylene sheath layer, the aluminum alloy conductor layer comprises a conductor inner layer, a conductor middle layer and a conductor outer layer, and the conductor inner layer and the conductor outer layer are both formed by tightly twisting a plurality of aluminum alloy wires. The conductor middle layer is arranged between the conductor inner layer and the conductor outer layer, and the conductor middle layer is formed by uniformly arranging a plurality of aluminum alloy wires at intervals; a gap exists in the middle layer of the conductor, compared with a traditional compressed conductor cable, alternating current has skin effect characteristics, and the current density of the outer layer of the conductor is larger than that of the inner layer of the conductor, so that the utilization rate of the conductor is improved, and compared with a cable of the same specification, larger current can pass through the cable, the weight of the cable is reduced, and the cost is effectively reduced; air can circulate in gaps of the conductors, heat generated by the cable is taken away, and therefore the cooling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a fan tower cable capable of cooling. Background Art

[0002] Since the beginning of the 21st century, countries around the world have turned their attention to clean energy such as nuclear energy, photovoltaics, and wind energy. The development of renewable resources has become the energy strategy of most countries. Wind energy has attracted much attention due to its cleanliness, renewability, and extensive resources. The tower is a very important part of the wind power industry chain. It not only supports the entire wind turbine, but also absorbs the vibration of the wind turbine. In the wind turbine, the cable in the tower is a fixed cable. Since the wind energy tower cable is usually laid vertically on the cable rack on the inner wall of the tower, the current flowing through the cable conductor during operation is large. Since the cable conductor has resistance, heat will be generated during operation. If it is not removed in time, the heat will accumulate, causing the cable to age and affect the safe operation of the wind turbine. The conductor of the existing product is a tightly compressed stranded conductor. The single wire is tightly pressed together and cannot achieve cooling. Because the wind turbine has a large power generation and a large current, the cable heats up and the cable life is greatly reduced. At present, in order to reduce the heating of the cable, the method of increasing the cross-sectional area of ​​the conductor is adopted. This method not only increases the cost of the cable. In addition, due to the increase in cable weight, the quality requirements of the tower also increase, and the costs in all aspects are high. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a wind turbine tower cable capable of cooling.

[0004] The technical solution adopted by the utility model is: a temperature-reducing type wind turbine tower cable, comprising an aluminum alloy conductor layer, an ethylene propylene insulation layer and a chlorinated polyethylene sheath layer, the aluminum alloy conductor layer comprises an inner conductor layer, an intermediate conductor layer and an outer conductor layer, the inner conductor layer and the outer conductor layer are both formed by tightly twisting a plurality of aluminum alloy conductors, the intermediate conductor layer is arranged between the inner conductor layer and the outer conductor layer, and the intermediate conductor layer is formed by evenly spaced multiple aluminum alloy conductors.

[0005] Preferably, the EPDM insulation layer is tightly wrapped around the conductor outer layer, and the cross-sectional shape of the EPDM insulation layer is consistent with the cross-sectional shape of the conductor outer layer.

[0006] Preferably, the aluminum alloy wires in the inner conductor layer and the outer conductor layer are wound in opposite directions, and the aluminum alloy wires in the middle conductor layer are pressed tightly between the inner conductor layer and the outer conductor layer to fix the middle conductor layer.

[0007] Preferably, the aluminum alloy wires in the conductor middle layer are arranged as 6 single wires, and a gap of a single wire distance is formed between every two single wires.

[0008] Preferably, the aluminum alloy wire adopts a round or shaped wire-pressed annealed aluminum alloy conductor twisted structure, the EPDM insulation layer adopts EPDM rubber that meets the EPR type requirements in standard GB / T 29631-2013, and the chlorinated polyethylene sheath layer adopts a rubber elastomer sheath material that meets the SH type sheath requirements in standard GB / T 29631-2013.

[0009] Beneficial effects of the utility model: There are gaps in the middle layer of the conductor in the utility model. Compared with traditional compressed conductor cables, alternating current has skin effect characteristics, and the current density of the outer layer of the conductor is greater than that of the inner layer, thereby improving the conductor utilization rate. Compared with cables of the same specifications, a larger current can pass, reducing the weight of the cable and effectively reducing the cost. Air can flow between the gaps between the conductors to take away the heat generated by the cable, thereby achieving a cooling effect, thereby preventing cable aging, extending the service life of the cable, preventing the cable from being damaged due to heat, and improving safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Markings in the figure: 1, aluminum alloy conductor layer, 2, EPDM insulation layer, 3, chlorinated polyethylene sheath layer, 4, conductor inner layer, 5, conductor middle layer, 6, conductor outer layer. DETAILED DESCRIPTION

[0012] The present invention is further described below with reference to specific embodiments.

[0013] As shown in the figure, a cooling type wind turbine tower cable comprises an aluminum alloy conductor layer 1, an ethylene propylene insulation layer 2 and a chlorinated polyethylene sheath layer 3. The aluminum alloy conductor layer 1 comprises an inner conductor layer 4, an intermediate conductor layer 5 and an outer conductor layer 6. The inner conductor layer 4 and the outer conductor layer 6 are formed by tightly twisting a plurality of aluminum alloy conductors. The intermediate conductor layer 5 is arranged between the inner conductor layer 4 and the outer conductor layer 6. The intermediate conductor layer 5 is formed by evenly spaced multiple aluminum alloy conductors. By setting gaps between the single wires of the aluminum alloy conductors in the conductor intermediate layer, the current mainly flows in the outer layer of the cable conductor due to the skin effect, thereby improving the conductor utilization rate; at the same time, since the cable is laid vertically, the heat generated by the cable can be taken away by the air flowing in the gap in the conductor, thereby reducing the cable temperature, preventing the cable insulation from aging too quickly, extending the service life, and making the wind turbine operation safer.

[0014] As another preferred embodiment of the present invention, the EPDM insulation layer 2 is tightly wrapped around the conductor outer layer 6 , and the cross-sectional shape of the EPDM insulation layer 2 is consistent with the cross-sectional shape of the conductor outer layer 6 .

[0015] As another preferred embodiment of the present invention, the aluminum alloy wire in the conductor outer layer 6 is wound in opposite directions to the conductor inner layer 4, and there is an arch-like gap between the two. The aluminum alloy wire in the conductor middle layer 5 is tightly compacted by the aluminum alloy wires in the conductor inner layer and the conductor outer layer, thereby achieving effective fixation of the conductor middle layer 5. This structural setting can prevent the conductor middle layer from shifting when the cable is in use.

[0016] As another preferred embodiment of the utility model, the aluminum alloy wire of the conductor middle layer 5 is set to 6 single wires, and a gap of a single wire distance is formed between every two single wires. In the aluminum conductor of the utility model, two adjacent single wires in the conductor middle layer are spaced a single wire apart, and the outer layer is twisted normally, so that the utility model has a large conduction current, can reduce temperature, is safer, and improves the cable's ability to conduct current per unit aluminum cross section compared to existing wind turbine tower cables.

[0017] As another preferred embodiment of the present invention, the aluminum alloy wire adopts a round or shaped wire-pressed annealed aluminum alloy conductor twisted structure, the EPDM insulation layer 2 adopts EPDM rubber that meets the EPR type requirements of standard GB / T 29631-2013, and the chlorinated polyethylene sheath layer 3 uses a rubber elastomer sheath material that meets the SH type sheath requirements of standard GB / T 29631-2013.

[0018] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or simple modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all within the scope of protection of the present invention.

Claims

1. A temperature-reducible wind turbine tower cable, characterized in that: The invention comprises an aluminum alloy conductor layer (1), an ethylene propylene insulation layer (2) and a chlorinated polyethylene sheath layer (3); the aluminum alloy conductor layer (1) comprises an inner conductor layer (4), an intermediate conductor layer (5) and an outer conductor layer (6); the inner conductor layer (4) and the outer conductor layer (6) are both formed by tightly twisting a plurality of aluminum alloy wires; the intermediate conductor layer (5) is arranged between the inner conductor layer (4) and the outer conductor layer (6); and the intermediate conductor layer (5) is formed by evenly spaced aluminum alloy wires.

2. A wind turbine tower cable capable of cooling according to claim 1, characterized in that: The ethylene propylene insulation layer (2) is tightly coated outside the conductor outer layer (6), and the cross-sectional shape of the ethylene propylene insulation layer (2) is consistent with the cross-sectional shape of the conductor outer layer (6).

3. The wind turbine tower cable with a coolable temperature according to claim 1, characterized in that: The aluminum alloy wires in the conductor inner layer (4) and the conductor outer layer (6) are wound in opposite directions, and the aluminum alloy wires in the conductor middle layer (5) are pressed tightly between the conductor inner layer (4) and the conductor outer layer (6) to achieve fixation of the conductor middle layer (5).

4. The wind turbine tower cable capable of cooling according to claim 3, characterized in that: The aluminum alloy wires of the conductor intermediate layer (5) are arranged as 6 single wires, with a gap of a single wire distance formed between every two single wires.

5. The wind turbine tower cable with temperature reduction capability according to claim 1, characterized in that: The aluminum alloy conductor adopts a round or profiled annealed aluminum alloy conductor twisted structure, the ethylene propylene rubber insulation layer (2) adopts ethylene propylene rubber that meets the EPR type requirements of standard GB / T 29631-2013, and the chlorinated polyethylene sheath layer (3) adopts a rubber elastomer sheath material that meets the SH type sheath requirements of standard GB / T29631-2013.

Images